Definition of hysterically adverb from the Oxford Advanced Learner's Dictionary

 

hysterically

 adverb
adverb
BrE BrE//hɪˈsterɪkli//
 
; NAmE NAmE//hɪˈsterɪkli//
 
 
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in an extremely excited and uncontrolled way, often with crying or laughter to laugh/cry/scream/sob hysterically hysterically funny (= extremely funny, often so funny that it makes you cry with laughter)